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Borrowings - Summary of Bancorps Short Term Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
FHLB Advances
Short-term Debt [Line Items]
Maximum outstanding at any month end	$ 850,000	$ 910,000	$ 1,190,150
Average balance during the year	$ 264,704	$ 809,788	$ 793,304
Weighted-average interest rate during the year	2.35%	2.31%	2.66%
Federal Funds Purchased
Short-term Debt [Line Items]
Maximum outstanding at any month end	$ 365,000	$ 842,000	$ 600,000
Average balance during the year	$ 22,110	$ 239,481	$ 271,400
Weighted-average interest rate during the year	0.07%	0.19%	2.28%

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b))
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- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph (a)

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-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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